*{margin: 0 ; padding: 0;}
#nav{
    text-align: center;
    margin: 5px;
}
a{
    text-decoration: none;
    color: #000;
    line-height: 30px;
}
div[id]{
    height: 500px;
    border: 1px solid blue;
    display: inline-block;
}
#left{
    width: 200px;
    float:left;
    margin-right: 10px;
    text-align: center;
}
#right{
    width: 900px;
}
#left dl{
    margin-top: 10px;
}
#left dd{
    margin: 10px;
}